Chairman Mao First Day Cover With Perfect Cancellation?

China centenary birth of the Chairman mao first day cover with perfect cancellation


The white cover is with complete shape for the chinese characters,picture and number right on black cancellation as the perfect cancellation on the stamp and first day cover there

For the signature which the last chinese character has shifted out right from the stamp to the cover and it is certainly unusual and clear to look at it right now on the position


The black cancellation which has extra dot beside there and it is a constant variety after it has compared with other similar cover together to confirm for sure there


For the stamp which in the upright position and the black cancellation is perfect on center which has done from the machine on the stamp and the cover position


However,I need to confirm the perfect cancellation is extremely rare or not from the experts.I will get back to you as soon as possible after your reply to me.The personal opinion and explanation are needed later to me there.I would apprieiciate your help so much as usual.Please check it out on the scans below and let me know what you think right now there.Thank you